Firstly, she’s stunning! Won’t have an issue attracting bulls.
I’d say there’s a number of things your going introduce her too; the obvious ones are…
- sharing her / her getting fucked by other men
- wanting it to be a BBC
- you might be a cuck
Rather than hitting her with all that at once maybe start with a chat (might be best via text but do what works for you) about what fantasy she might have, she’ll inevitably ask you the same and when she asks tell her it’s to have a MFM 3sum. See how she reacts, let her get used to that. She may reject the idea at first or accuse you of not valuing her; explain it’s not the case, etc… Periodically bring it up so she knows you’re serious about it. When you intuition tells you she accepted that as part of what you get turned on by, add the next element that’s, you’d want it to be BBC.
You have to work at normalising the life style to her. A lot of people reject the life style because it seems like something “other people” do, but you need to normalise it between the both of you by discussing it, this can take a long, long time, but once it’s normalised you’ll have a much better chance of proposing a successful MFM session. Talk about it like it’s a one off thing. Don’t make it a life long commitment she’s pressurised to accept.
Use BBC porn too. Each woman’s different, some are far more liberal sexually than others, but you have a good chance if you think about this from her perspective. We as men just want to dive head first into a real life porno, but that’s not how it starts for most women, however it can end that way if you let her take things at her own speed and in a way that doesn't reduce her to a sexual toy for your own personal use.
Good luck!